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A halophilic archaeal strain,YJ-18-S1T,was isolated from Yangjiang marine solar saltern,Guangxi Province,China.Cells were pleomorphic,stained Gram-negative and formed red-pigmented colonies on agar plate.Strain YJ-18-S1T was able to grow at 20-55 ℃(optimum 37 ℃),at 0.9-4.8 M NaCl(optimum 2.6 M NaCl),at 0.005-1.0 M MgCl2(optimum 0.3 MgC12)and at pH 5.5-8.5(optimum pH 7.0).The cells lysed in distilled water and the minimal NaCl concentration to prevent cell-lysis was found to be 5%(w/v).The major polar lipids of the strain werephosphatidic acid(PA),phosphatidylglycerol(PG),phosphatidylglycerol phosphate methyl ester(PGP-Me),phosphatidylglycerol sulfate(PGS)and sulfated rnannosyl glucosyl diether(S-DGD-3).The 16S rRNA gene and rpoBgene of strain YJ-18-S1T were phylogenetically related to the corresponding genes of Halorubrum members(94.3-98.0%and 90.1-96.1%similarities,respectively).The DNA G+C content of strain YJ-18-S1T was 66.2 mol%.The phenotypic,chemotaxonomic and phylogenetic properties suggested that strain YJ-18-S1T(=CGMCC 1.12554T =JCM 30030T)represents a new species of Halorubrum,for which the name Halorubrum sulfidifaciens sp.nov.is proposed.